AC Losses in Hard Superconductors
Fagan, McFee, and others have suggested the possibility of building transformers, transmission lines, rectifiers, rotating equipment, and other ac power equipment using superconductors. The practicability of many of these devices depends on the feasibility of producing superconductors that will carry high ac current densities at high ac magnetic fields with little or no loss. In view of this, the authors have undertaken a program to determine the magnitude of the ac losses in various types of superconductors and to see what factors affect these losses. It was also felt that such a study might form a basis for a better understanding of mixed-state superconductors. This paper reports some experimental ac loss measurements made on coils of Nb-Zr wire.
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